Two objects A and B have the same mass and the same specific heat. Object A is heated from 30°C to 70°C and object B is cooled from 70°C to 30°C. How are the thermal energies of the two objects related after the temperature change has occurred?

A. The thermal energies of A and B have the same magnitude but opposite signs.
B. The thermal energy of A is 40 kJ and the thermal energy of B is 30 kJ.
C. The thermal energy of B is higher than the thermal energy of A.
D. The thermal energies of A and B are the same.

Question

Two objects A and B have the same mass and the same specific heat. Object A is heated from 30°C to 70°C and object B is cooled from 70°C to 30°C. How are the thermal energies of the two objects related after the temperature change has occurred?

 		A.	The thermal energies of A and B have the same magnitude but opposite signs.
 		B.	The thermal energy of A is 40 kJ and the thermal energy of B is 30 kJ.
 		C.	The thermal energy of B is higher than the thermal energy of A.
 		D.	The thermal energies of A and B are the same.

vera_ewing · Answer

@JoannaBlackwelder Please help me!

vera_ewing · Answer

I'm pretty sure it's B....

joannablackwelder · Answer

Hm, how do you get those values?

vera_ewing · Answer

Oh wait no it's A lol sorry :) Thank  you!

joannablackwelder · Answer

Yes, good. :)